document how to connect to local api servers

I feel like for local development having a server that is served on another port is common, however production may quite frequently require quite a different configuration.

for webpack the best option seems to be proxy, it took me a while to figure out how to even provide this configuration http://stackoverflow.com/q/39030700/206466

Start by locating the documentation section covering local development and webpack configuration. Document how to connect to an API server on another local port using webpack's proxy option, and explain how this differs from production configuration; the documentation should let readers configure and verify a local connection.

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